Inside flash trimmer



Nov. M, w67 M. B. THOMAS ETAL 3,352,208

INSIDE FLASH TRIMMER nnlllllllf IIIIIU /A/VE/VTORS. WILLIAM/1. DALL-"BOUT and MCK//VLEV B. THOMAS @y d Awww/@7M 9%/ Attorney United States Patent Office 3,352,208 Patented Nov. 14, 1967 The present invention relates generally to the manufacture of welded pipe and more particularly has as its primary object the provision of an improved ash trimmer for trimming the inside flash or burr from longitudinally welded metal pipe or tubing during the manufacture thereof.

It is another object of the invention to provide an improved flash trimmer as set forth above having controllable positive means for urging the cutter element of the device into engagement with the inside flash to be trimmed.

These and other objects will become more apparent after referring to the following specification and attached drawings, in which:

FIGURE 1 is a plan view;

FIGURE 2 is an elavational view partly in section taken substantially along the line `II---II of FIGURE l;

FIGURE 3 is a cross-sectional view taken substantially along the line III-Ill of FIGURE 2; and

FIGURE 4 is a partial View of FIGURE 2 showing the relative positions of the tool shank and supporting carriage elements of the invention with the piston rod in retracted position.

Referring more particularly to the drawings, reference numeral 2 indicates generally the body of the ash trimmer of the invention shown positioned inside a longitudinal pipe P with the groove 22 thereof engaging the lflash B The body 2 includes two elongated plates 4 arranged in spaced parallel relation and secured at one end to opposite sides of a spacer block 6 by means of bolts 8 and at the other end to a support tube 10 which, in turn, is rigidly fastened to and extends from a unit of the pipe producing line (not shown). The tube 10` serves to support the device in stationary position. A tool shank 12 is pivotally supported between the plates 4 adjacent the spacer block 6 by means of a pair of stub pins 14 one of which extends through each of the plates 4. The tool shank 12 is generally similar to that disclosed by Patent No. 2,714,338 and includes a cutter element 16 which is adapted to cut the flash B from the interior wall of the pipe as will become apparent hereinafter. The pins 14 are engaged in openend slots 13 in each of the plates 4 for convenience of assembly. Rollers 20 provided with peripheral grooves 22 are rotatably mounted on each end of the tool shank 12. The roller 20 on the rearward end 24 of the tool shank 12 normally abuts the upper surface of the inner wall of the pipe P with the grove 22 thereof engaging the flash B thereby guiding the pipe as it travels over the tool shank. The roller 20 at the forward end 26 ofthe tool shank also engages the upper surface of the interior pipe wall. This roller is provided with a peripheral groove for the purpose of engaging the remnant of the flash B remaining after it has been trimmed to desired thickness. In the event that the flash bead has been completely removed, the roller engages the interior wall surface of the pipe with no function being performed by the groove. In operation, the pipe travels over the stationary llas-h trimmer in the direction indicated by the arrow 27, in FIGURE 2.

A support carriage 28 is disposed between the plates 4 rearwardly of and below the tool shank 12. The supporting carriage is provided with a pair of rollers 29 adapted to engage the interior wall of the pipe P in a region diametrically opposite that engaged by the rollers 20 on the tool shank. The support carriage 28 includes two side plates 30 arranged in spaced parallel relation and connected by shoulder pins 3-2 which extend transversely be tween the plates inside the plates 4. A link 34 which is generally T-shape in configuration is attached at its head end to the plates 4 by means of a transversely extending pin 36. The head 38 of the link 34 extends transversely between the plates 4 as best shown in FIGURE 1, and the pin 36 extends through the head 38. The bottom of the link is pivotally mounted on one of the pins 32 of the support carriage 28. 'I'he head 38 of the link is pivotal on the pin 36. The link extends downwardly from the upper portion of the pair of plates 4 at an oblique angle to the length of the plates thereof.

A block 40` having a tapped opening therein is disposed between the sideplates 30 adjacent the upper edges thereof at the rear of the carriage 28. A double-acting pressure cylinder 42 s disposed between the plates 4 with its head end pivoted on a pin 44 which extends transversely between the plates 4. The piston rod 46 of the pressure cylinder is threaded into the block 40. Hydraulic lines 48 connected with the head and rod ends of the cylinder 42 extend therefrom through the support tube 10 to a fluid supply source (not shown).

A tube S0 for supplying cutting oil to the cutter of the tool shank also extends through the support tube 10.

In operation, the cylinder 42 is actuated to project its piston rod 46, from a retracted position as shown in FIG- URE 4, and apply thrust to the support carriage 28 as the pipe P moves over the device in the direction indicated by `the arrow 27, in FIGURE 2. When the thrust force is thus applied to the support carriage, the link 34 pivots about the pin 36 in clockwise direction, as seen in FIGURE 2, so as to increase the vertical separation between the plates 4 and the support carriage 28 which causes the cutter element of the tool shank 12 carried by the plates 4 to be ldriven in the direction toward the pipe wall so far as it is limited by the rollers 20 on the tool shank. The cutter element 16 of the tool shank is adjustable by means of a set screw 54 so that adjustments of the cutter element 16 may be made in accordance with the thickness of flash bead to be trimmed from the pipe. The cutter element 16 is held in place by a wedge 56 which, in turn, is secured in the tool shank 12 by a bolt 58.

While we have shown but one embodiment of our invention, it will be apparent that other adaptations and modications may be made without departing from the scope of the following claim.

We claim:

An inside flash tri-mmer for welded pipe comprising a pair of spaced parallel side plates, a tool-holder block pivoted between said plates and having rollers spaced therealong adapted to engage the interior of the pipe, a supporting carriage between said plates having rollers spaced therealong adapted to engage the interior of the pipe in a region diametrically opposite that engaged by said first-mentioned rollers, a link disposed between said plates at an oblique angle to 4the length thereof and pivoted thereto and to said carriage, and power means mounted between said plates adapted to apply thrust to said carriage thereby tending -to increase the separation between said carriage and said side plates.

References Cited UNITED STATES PATENTS 8/-1955 Nance 901-24 XR 4/1965 Mark-hanka 90-24 UNITED STATES PATENT oFFICE CERTIFICATE OF CORRECTION Patent No. 5,352,208 November 14, 1967 McKinley B. Thomas et al.

It is hereby Certified that error appears in the above numbered patent requiring correction and that the Said Letters Patent should read as corrected below.

b Column l, line 35, strike out "with the groove 22 thereof engag1ng-the flash B" and insert instead having a flash bead B on the lnner surface thereof Signed and sealed this 17th day of December 1968.

(SEAL) Attest;

EDWARD J. BRENNER Edivard M. Fletcher, Jr.

Commissioner of Patents Attesting Officer 

